Lens



FIG. 1 is a front view of an optical element showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof; the left side being a mirror image thereof;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 2;

FIG. 7 is a perspective view as seen from the lower front side; and,

FIG. 8 is a perspective view as seen from the upper right side. 

CLAIM The ornamental design for a lens, as shown and described. 